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Patterning the Geometry of Human Embryonic Stem Cell Colonies on Compliant Substrates to Control Tissue-Level Mechanics
Published on: September 28, 2019
Patterning network structure to spatially control cellular remodeling and stem cell fate within 3-dimensional
Sudhir Khetan1, Jason A Burdick
1Department of Bioengineering, University of Pennsylvania, 210 S 33rd Street, Philadelphia, PA 19104, USA.
Biomaterials
|August 3, 2010
Summary
Researchers created advanced hyaluronic acid hydrogels that spatially control cell behavior. These 3D materials enable precise manipulation of cell remodeling and differentiation for tissue engineering.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Cellular Biology
Background:
- Spatially directed 3D remodeling of synthetic materials is crucial for controlling cell behavior.
- Hyaluronic acid hydrogels offer a versatile platform for tissue engineering applications.
Purpose of the Study:
- To develop a method for synthesizing hyaluronic acid hydrogels with spatially controlled remodeling properties.
- To investigate how differential network structures influence cellular remodeling and cell fate decisions.
Main Methods:
- Sequential crosslinking of hyaluronic acid hydrogels: primary protease-degradable peptide crosslinks followed by secondary UV-induced non-degradable kinetic chains.
- Utilizing differential network structures (-UV: primary crosslinking only; +UV: sequential crosslinking) to modulate cellular remodeling.
- Validating hydrogel behavior using chick aortic arch outgrowth and encapsulated mesenchymal stem cell (MSC) spreading and differentiation assays.
Main Results:
- Hydrogel network structures (-UV vs. +UV) differentially controlled cellular remodeling, with -UV permitting remodeling and +UV inhibiting it.
- Chick aortic arch outgrowth and MSC spreading were spatially controlled, occurring only in -UV regions.
- Spatial control of MSC spreading via hydrogel network structure influenced adipogenic and osteogenic differentiation pathways.
Conclusions:
- Developed a novel sequential crosslinking strategy for hyaluronic acid hydrogels to achieve spatially directed 3D cell remodeling.
- Demonstrated the ability to control cell behavior, including tissue outgrowth and stem cell fate, through engineered microenvironmental cues.
- This approach holds significant potential for advanced tissue engineering applications requiring precise spatial control of cells within 3D scaffolds.
